Daikin LX10F11B3 - 1.4 Operation Mode and Control

1-11
1.4 Operation Mode and Control
1.4.1 Frozen Mode
●Set Point and Control Temperature Sensor
Unit operates in frozen mode between Set Point
-10.0℃ 〜 -30.0℃ . The temperature control
in frozen mode is controlled by the return air
temperature sensor (RS).
●Display
FROZEN is displayed
on the upper left
and FULL COOL, or
COOLING OFF is
displayed on the upper
right of the screen. RETURN temperature (RS) is
displayed under SET POINT.
●Operation mode
FULL COOL＜Pull down＞
Compressor runs at full capacity during pull-down
operation. ESV opens to activate economizer
circuit, then pull-down capacity is increased by sub-
cooling the liquid refrigerant entering EEV.
EFM runs at high speed but it runs low speed when
RS drops to -5.0℃ .
FULL COOL＜Modulation＞
When RS drops to ≦SP, unit will enter to the
modulating cooling. Compressor speed is
modulated in response to temperature difference
between RS and SP.
COOLING OFF
When RS still drops to ≦SP-0.5℃ , unit will enter
to Cooling OFF. Compressor stops and EFM
continues to run at low speed. If temperature rises
to ≧SP+0.5℃ , the unit will return to the modulated
cooling.
●Condenser Fan Motor, CFM
CFM will run with high, low or OFF in response to
high pressure (HPT). (High Pressure Control)
▲
▼
FULL COOL
-0.5℃
SP
SP
+0.5℃
Falling
Temperature
Rising
Temperature
Cooling OFF
Operation Flow in Frozen Mode
+2.0℃
Modulation
Full cool
with
Economized
cooling
Valve chamber
Economizer
Reheat coil (option)
Condenser
Receiver
Compressor
HPT
HPS
EMV
ESV
LSV
Dryer
EEV
LPT
Evaporator
CFM
EFM
RSVHSV
PRV
DMV
Sight glass
01章LX10F11B3TR16-02En.indd1-1101章LX10F11B3TR16-02En.indd1-11 2016/02/029:09:342016/02/029:09:34
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